"server" directive is not allowed here in /etc/nginx/nginx.conf:13

I'm trying to set up an elasticsearch-Server based on an openSuSE-Appliance from here: https://susestudio.com/a/8ODadE/elastic-search-64-bit

I followed this tutorial to set up logstash and so on: https://www.digitalocean.com/community/tutorials/how-to-use-logstash-and-kibana-to-centralize-and-visualize-logs-on-ubuntu-14-04

Now I'm stuck on the NGINX-Setup and this is my current nginx.conf:

#
# Nginx proxy for Elasticsearch + Kibana
#
# In this setup, we are password protecting the saving of dashboards. You may
# wish to extend the password protection to all paths.
#
# Even though these paths are being called as the result of an ajax request, the
# browser will prompt for a username/password on the first request
#
# If you use this, you'll want to point config.js at http://FQDN:80/ instead of
# http://FQDN:9200
#
server {
listen *:80 ;